what is the difference between Twitter and FB that you are alluding to?
AFAIK Twitter is facing more troubles with censorship- banning some prominent faces, while FB has been more lenient overall.
There's a difference in perception. Twitter in India has a larger proportion of academics (who tend to be left leaning), intellectuals, and a larger portion of the English speaking urban professional population. There's more scope for speech critical of the government on Twitter. On the other hand, Facebook is far more popular, and captures a broader cross section of the population whose political views tend towards the mean in India.